What this MCCB is and what it does
The Siemens 3VA1132-4EF32-0AD0 is a SENTRON molded case circuit breaker (MCCB) for line protection, rated 32 A continuous current (Iu) with a TM240 thermal-magnetic overcurrent release. It's a 3-pole unit built for distribution and light industrial feeder circuits where you need high interrupting capacity in a compact footprint — 70 mm deep, 76.2 mm wide, 130 mm tall. The interrupting ratings tell you where it fits: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V. That 121 kA at 240 V puts it squarely in high-fault panels — think large transformer secondaries or busway drops where a standard 25 kA MCCB would weld closed. The 75.6 kA at 415 V covers most European 400 V distribution without needing a current-limiting fuse upstream. Thermal derating is flat to 50 °C (32 A), then drops to 30.72 A at 55 °C, 30.08 A at 60 °C, 29.44 A at 65 °C, and 28.8 A at 70 °C. If your panel ambient runs above 50 °C, size the breaker for the lower current — the TM240 release won't trip early, but you lose headroom.
Panel integration and wiring
Mounts on a DIN rail or panel-mount baseplate — the 76.2 mm width is a standard 3-pole MCCB footprint, so it drops into existing SENTRON or third-party enclosures without re-drilling. IP40 on the front means it's fine for indoor panel use; keep the enclosure sealed against washdown. Comes with 3 auxiliary switches HQ (high-quality) built in — no separate aux contact block to order. No undervoltage release, no shunt trip, no ground-fault monitoring, no communication module. This is a straight line-protection breaker; if you need those options, look at the 3VA1 variants with the appropriate release code. Rated insulation voltage Ui is 800 V, so it's suitable for 690 V systems with proper clearance. Latching endurance is 15,000 operations — not a switching breaker for frequent motor starts, but fine for infrequent manual isolation or backup protection.
Compliance and documentation
Reference code per DIN EN 81346-2 is Q (switching device). The manufacturer provides RoHS and REACH declarations, plus UL and IEC certifications as standard for the SENTRON family. Always verify the specific certification mark on the nameplate for your jurisdiction.